Michelin c4 airstop butyl mtb bike tubethe airstop butyl tubes are an economical long lasting tube with good puncture resistance 09mm wall thickness for optimum puncture protection and also the butyl tubes provide better resistance to friction caused by spokes and old rim tape features 26x150 2 10 650c valve presta french or schrader standard 35 40 or 60mm valves buymichelin wheels tyresfrom chain reaction cycles the worlds largest online bike store